I'm not sure, but you should be able to trial. The speedo can't be hurt as the worst it will see is continuous 12 V.

To calibrate, just do the 1 mile calibration against a GPS odometer to start. If you want more accurate, check the odometer against a GPS over a long distance and manual change the calibration number. If you are careful with the 1 mile setting (start from a stop and stop at exactly 1 mile) it will be very accurate. On mine, I find this sets the odometer exact and the speedo runs 2 mph high. I suspect on purpose for speeding ticket liability.... You can adjust the needle to match the odometer if you are anal with a separate adjustment.

So i finally managed to eliminate all the speedo cables and the VSS in my truck and replace it with a YBE10040 and a VDO speedo. The trick was to run a resistor inline with the ECU feed ... this limits the current and prevents the YBE10040 burning out. I used the resistor from the old VSS which i extracted during open VSS surgery. Tapping into the other side I ran a wire up to the speedo. Grabbed a 12v feed from the ones feeding into the other dials and attached a ground.

So i finally managed to eliminate all the speedo cables and the VSS in my truck and replace it with a YBE10040 and a VDO speedo. The trick was to run a resistor inline with the ECU feed ... this limits the current and prevents the YBE10040 burning out. I used the resistor from the old VSS which i extracted during open VSS surgery. Tapping into the other side I ran a wire up to the speedo. Grabbed a 12v feed from the ones feeding into the other dials and attached a ground.

A few minutes calibrating against the GPS and voila!

That is great news - I have gotten my VDO to mostly work with the stock VSS but the VDO needle is jumpy and if I am stopped it sometimes still shows I am going 10 MPH (give or take some MPH)

So correct me if I am wrong to do your process:
- replace cable and VSS that goes to the t-case with the YBE10040
- run ECU wire from YBE10040 (is it yellow?) to resister from the original VSS to the original yellow wire from the vehicle that talks to the ECU.
- splice a wire to that yellow wire to go to the VDO
- the other YBE10040 wire goes to the green (power) wire from the original VSS.
- at the dash - power and ground to the VDO gauge. Wire that was spliced to the YBE10040 goes to position 8 (IIRC) in back of the VDO.
- calibrate

This is one thing I would love to sort out 100% before I sell my NAS. Bouncy guages drive me bonkers!

So i finally managed to eliminate all the speedo cables and the VSS in my truck and replace it with a YBE10040 and a VDO speedo. The trick was to run a resistor inline with the ECU feed ... this limits the current and prevents the YBE10040 burning out. I used the resistor from the old VSS which i extracted during open VSS surgery. Tapping into the other side I ran a wire up to the speedo. Grabbed a 12v feed from the ones feeding into the other dials and attached a ground.

A few minutes calibrating against the GPS and voila!

I just swapped out the VSS for a YBE100540 on my '94. It cured the bouncy speedo problem nicely, plus no more stupid speedo cables! I haven't connect the ECU to it yet because of what you said about burning out the YBE. Do you know for sure that it will burn out, did it happen to you?

I don't want to break open my VSS because it still works. Do you know what value the resistor is?

I just swapped out the VSS for a YBE100540 on my '94. It cured the bouncy speedo problem nicely, plus no more stupid speedo cables! I haven't connect the ECU to it yet because of what you said about burning out the YBE. Do you know for sure that it will burn out, did it happen to you? I don't want to break open my VSS because it still works. Do you know what value the resistor is? Thanks

I ended up putting 0.25 watt 120 ohm resister in line with the ECU and it's been fine

Thanks for all your help guys!!! After wiring to John's instructions, everything works great. I sourced the YBE from John Craddock, the wire/plug from Atlantic British and the VDO from www.eGauges.com Mack at eGauges.com was super helpful working with me to get the speedo pre-programmed to have my original odometer reading. -Lee

How did the preprogramming process work? Did they so it prior to shipping or did you do it?